Samsung SGH-N700 service manual.pdf

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SAMSUNG Anycall
SGH-N700
SAMSUNG Anycall
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CONTENTS
Specification
Circuit Description
Exploded Views and Parts List
Electrical Parts List
Block Diagrams
PCB Diagrams
Flow Chart of Troubleshooting
ⓒ
Samsung Electronics Co.,Ltd. January. 2005
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
Printed in Korea.
International and/or domestic law.
Code No.: GH68-06532A
BASIC.
1 . S GH - N7 0 0
S p e c if ic a t io n
1. GSM General Specification
G SM 9 0 0
Ph a s e 1
F r eq . B a n d [M Hz ]
Up l in k / Do w n li n k
A RF C N r a n g e
8 9 0 ~9 1 5
9 3 5 ~9 6 0
1 ~1 2 4
EGS M 9 0 0
Ph a s e 2
8 8 0 ~9 1 5
9 2 5 ~9 6 0
0 ~1 2 4 & 9 7 5 ~ 1 0 2 3
DC S1 8 0 0
P h as e 1
1710~1785
1805~1880
512~885
T x /R x s p ac in g
Mo d . B i t r at e/
Bi t Pe r i o d
Ti me Sl o t
P er io d / F r am e P er i o d
Mo d u l a ti o n
M S P o we r
Po w er C l as s
Se n si t iv i t y
TDM A M u x
C el l Ra d iu s
4 5 MH z
2 7 0 .8 3 3 k b p s
3 .6 9 2 u s
5 7 6 .9 u s
4 . 6 1 5 ms
0 . 3 GMS K
3 3 d B m~1 3 d B m
5 p cl ~ 1 5 p c l
- 1 0 2 d Bm
8
35Km
4 5 MH z
2 7 0 .8 3 3 k b p s
3 .6 9 2 u s
5 7 6 .9 u s
4 . 6 1 5 ms
0 . 3 GMS K
3 3 d B m~5 d B m
5pcl ~ 19pcl
- 1 0 2 d Bm
8
35Km
9 5 M Hz
2 7 0 .8 3 3 k b p s
3 .6 9 2 u s
5 7 6 .9 u s
4 .6 1 5 m s
0 .3 GM SK
3 0 d B m~ 0 d B m
0pcl ~ 15pcl
-100dBm
8
2 Km
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Specification
2. GSM TX power class
TX Power
control level
5
GSM900
TX Power
control level
0
DCS1800
33¡¾2 dBm
30¡¾2 dBm
6
31¡¾2 dBm
1
28¡¾3 dBm
7
29¡¾2 dBm
2
26¡¾3 dBm
8
27¡¾2 dBm
3
24¡¾3 dBm
9
25¡¾2 dBm
4
22¡¾3 dBm
10
23¡¾2 dBm
5
20¡¾3 dBm
11
21¡¾2 dBm
6
18¡¾3 dBm
12
19¡¾2 dBm
7
16¡¾3 dBm
13
17¡¾2 dBm
8
14¡¾3 dBm
14
15¡¾2 dBm
9
12¡¾4 dBm
15
13¡¾2 dBm
10
10¡¾4 dBm
16
11¡¾3 dBm
11
8¡¾4dBm
17
9¡¾3dBm
12
6¡¾4 dBm
18
7¡¾3 dBm
13
4¡¾4 dBm
19
5¡¾3 dBm
14
2¡¾5 dBm
15
0¡¾5 dBm
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2 . S GH - N7 0 0
C ir c u it
D e s c r ip t io n
1. SGH-N700 RF Circuit Description
1) RX PART
1. FEM(U402(SWITCHPLEXER+FILTER)) ¡æ Switching Tx, Rx path for E`GSM900, and DCS1800 by logic controlling.
2. FEM Control Logic (U402) ¡æ Truth Table
VC1
DCS / PCS Tx Mode
GSM Tx Mode
GSM / DCS Rx Mode
L
H
L
VC2
H
L
L
3. FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.
- GSM FILTER (U402(SWITCHPLEXER+FILTER)) ¡æ For filtering the frequency band between 925 ~ 960 MHz
- DCS FILTER(U402(SWITCHPLEXER+FILTER)) ¡æ For filtering the frequency band 1805 and 1880 MHz.
4. VC-TCXO (OSC401)
To generate the 13MHz reference clock to drive the logic and RF.
After additional process, the reference clock applies to the U900 Rx IQ demodulator and Tx IQ modulator.
The oscillator for RX IQ demodulator and Tx modulator are controlled by serial data to select channel and use fast lock
mode for GPRS high class operation.
5. SI 4205 (U404)
This chip integrates two differential-input LNAs.
The GSM input supports the E-GSM, DCS input supports the DCS1800. The LNA inputs are matched to the 200 ohm
differential output SAW filters through eternal LC matching network.
Image-reject mixer downconverts the RF signal to a 100 KHz intermediate frequency(IF) with the RFLO from frequency
synthesizer. The RFLO frequency is between 1849.8~1879.9MHz.
The Mixer output is amplified with an analog programmable gain amplifier(PGA), which is controlled by AGAIN.
The quadrature IF signal is digitized with high resolution A/D converts (ADC).
Also, this chip down-converts the ADC output to baseband with a digital 100 KHz quadrature LO signal. Digital
decimation and IIR filters perform channel selection to remove blocking and reference interface signals.
After channel selection, the digital output is scaled with a digital PGA, which is controlled with the DGAIN. DACs drive
a differential analog signal onto the RXIP, RXIN, RXQP, RXQN pins to interface to standard analog-input baseband IC.
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